Shimano XTR M972 Rear Derailleur SGS Long Cage
The Shimano XTR M972 rear derailleur is Shimano's top of the line 9 speed rear derailleur. If you haven't upgraded to 10 speed yet and want the best 9 speed rear derailleur you can get, you may want to consider the M972 top normal rear derailleur.
I am on my third derailleur on my current freeride rig, I bought this as I am leaning to more trail riding with a few crazy runs when I break free of the family on our rides. I gotta say for my rig the shifting has been butter smooth and I can still stand up and crank out through the gears if need be. I would recommend this for most XC and light freeride use. plus it looks cool on my flat black bike.